New NetGear R7800 - Where to start

I can just have access via ssh.
My password is not working via luCI interface

Please help me. Now what? I only have access to router via ssh. Not even my laptop has Internet. It connects to the wireless network but I can't ping www.google.com or any other site.
I can't afford to be without Internet due to my daughter's online classes

Maybe a complete reboot.
Modem first and router and clear your browser cache

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The other thing you might do is to reset the router to default settings. (which would mean no password, wifi initially disabled until you config it)

Based on your posts above you have tried various settings (wifi channels, DNS servers), but I am not quite so sure if all those are wise in the initial phase when you are unfamiliar with OpenWrt.

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If you are looking how to do it using the CLI, type this in a SSH session:

firstboot && reboot now

That will force me to reconnect the router with a lan cable, right?

Yes, it does.
And in general, using wired connection for flashing and initial config is the recommended practice.

I'm trying to enter wireless config to enable them and the Web interface just doesn't get there... I should never have done this. Fack me and my luck

If you have the SSH command line, then just download the official 19.07.2, flash it and be happy.

cd /tmp
wget https://downloads.openwrt.org/releases/19.07.2/targets/ipq806x/generic/openwrt-19.07.2-ipq806x-generic-netgear_r7800-squashfs-sysupgrade.bin
sysupgrade -n openwrt-19.07.2-ipq806x-generic-netgear_r7800-squashfs-sysupgrade.bin

Have you tried to clear your Web browser to forget about site http://192.168.1.1?

Then use https://192.168.1.1 instead. You might as well clear the whole browser cache (@ninjanoir78 previous recommandation) , or try a different browser that you never used to navigate to the Web interface, using the Private navigation.

Using https, you'll most probably have to click Advanced settings and choose to Accept the risks about the certificate not being valid because there is no certificate for this Luci page. But it'll be secure.

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I'm about to flash back the original one. I'll keep this to the weekend. I just hope to get Internet back

Even with the default firmware, I'm having problems that I didn't have before. My 2.4Ghz wireless network says it's disabled but without the red roun circle over it. I can't scan that network in any device. I can't add it manually because as soon as I click to add (after entering ESSID and password) it just goes away. disappears. I can only use 5Ghz one and not all devices at home support it!

I don't know what else to do.

Edited;
In Chromium I can't login in luCI. My root password is not accepted. In Firefox however, I can use it just right! :s

You have some excellent help above. Firefox should solve your problems for loading the sysupgrade file. The default is https://192.168.1.1/

Sounds like a good weekend project.

Did you reset the settings to defaults?

OpenWrt makes no permanent changes to your router. All settings are in files in the file system cleared at each flashing (unless you "keep settings" during sysupgrade). Resetting the router from LuCI or from SSH console will clear those settings. Then settings, including all wifi stuff, will be re-created at the next reboot with OpenWrt default values.

I don't know what happened I just know things went south pretty quickly. And due to my very limited knowledge in networking, I find myself in these situations pretty quickly. Somehow, and after a few minutes and some more help in IRC channels, that are live conversations, therefore faster, my 2.4Ghz wireless network finally got steady and started broadcasting itself and my older devices were able to connect to the network. But, in the end, I did absolutely any change to any configuration whatsoever. After some time it just started to broadcast. Or whatever it was not doing before.

About Chromium it still's not accepting the password. I have the password saved in a password manager both in Chromium and in Firefox and I can enter the password in Firefox but in Chromium it just jumps back to the screen on luCI with the password field empty. It doesn't even says the password is wrong, it just jumps back. The password is the same as before trying to flash hnyman's firmware

Maybe restart again. Press the reset button on the back, about 10 sec and release.

It might me just a feeling, but it looks to me that you might be trying to chew too much at the same time. And your browsers are playing tricks on you.

If you achieve success with setting up WiFi, please, clear your other malfunctioning station's browsers cache completely and remove the password for http://192.168.1.1 and https://192.168.1.1. Careful when clearing the password to not completely wipe them unless there is nothing valuable in there.

Then take a backup and name it "Wifi_working.tar.gz".

Edit: Changed my mind, just don't want to get you to lose access to Luci again since it looks that you already got it on at least one browser.

Hi. Thanks for the suggestions.

I'm still trying to figure out the passwords in Chromium. And until I can get rid of that problem, I won't move forward to anything else.
I think I have already cleared cache an cookies. And btw, I use a password manager, and this is LastPass which is installed in both Chromium and Firefox. So, I can't understand why this is happening.

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Weekend starts bad. Thunderstorm going on here and I have disconnected everything from power.

Well, I'm back to my laptop. I have taken a look to 'logread' in my router an I see this when I try to login in luCI using Chromium:

Fri Apr 24 22:08:04 2020 daemon.err uhttpd[822]: luci: accepted login on / for root from 192.168.1.112

Any idea of what might it be?